Genetic testing for obesity does not deter patients from trying to control their weight, according to a new study.
Doctors in London have been testing the effects of telling volunteers whether they carry a gene strongly link to a risk of becoming overweight.
The researchers wanted to ensure that finding out about the gene did not make patients fatalistic, leading to them decide not to attempt weight management.
Some 18 volunteers of different weights took part in the study at University College London, led by Professor Jane Wardle and fellow researcher Susanne Meisel.
They report that volunteers were "enthusiastic" about taking part.
They also found a small number of overweight people who carried the FTO gene. These described the finding as "helpful" because it relieved them of the emotional stress they felt from their struggle to manage their weight.
It also reduced stigma and self-blame, they report in the Journal of Genetic Counseling.
Ms Meisel said a study involving more patients was being conducted.
She said: "Regardless of gene status or weight, all the volunteers recognised that both genes and behaviour are important for weight control.
"The results indicate that people are unlikely to believe that genes are destiny and stop engaging with weight control once they know their FTO status. Although they knew that FTO’s effect is only small, they found it motivating and informative."
The findings were welcomed by the charity Weight Concern.
Director Dr Laura McGowan said: "The causes of obesity are multiple and complex, and this research is encouraging for those who struggle with their weight.
"Although we know genetics play a part in weight, people can learn strategies to deal with this increased risk for weight gain, so finding out you carry the high-risk version of the gene shouldn’t mean you surrender to fate."
Journal of Genetic Counseling September 2013
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